In this paper,three new technology-the closed cutting off water technology,rotary spray pile with inserting a steel tube as early supporting and framing supporting structure with bi-rows of mini-steel tube piles,were introduced and analyzed,which have been first used in the practice of deep foundation pit engineering in Japan,these cases can serve as referenc to similar engineering.

The HV whole-cast closed bus adopts anticorrosive inorganic mineral material as insulation material,has no protective shell.